) Revise the Flammable and Combustible Liquids standard (29 CFR§ 1910.106) to require
installing, using, and maintaining a high-integrity automatic overfill prevention system
with a means of level detection, logic/control equipment, and independent means of flow
control for bulk aboveground storage tanks containing gasoline, jet fuel, other fuel
mixtures or blendstocks, and other flammable liquids having an NFPA 704 flammability
rating of 3 or higher, to protect against loss of containment. At a minimum, this system
shall meet the following requirements:
1. Separated physically and electronically and independent from the tank
gauging system.
2. Engineered, operated, and maintained to achieve an appropriate level of
safety integrity in accordance with the requirements of Part 1 of International
Electrotechnical Commission (IEC) 61511-SER ed1.0B-2004, Functional
Safety – Safety Instrumented Systems for the Process Industry Sector. Such a
system would employ a safety integrity level (SIL) documented in
accordance with the principles in Part 3 of IEC 61511-SER ed1.0B-2004,
accounting for the following factors:
i. The existence of nearby populations and sensitive environments;
ii. The nature and intensity of facility operations;
iii. Realistic reliability for the tank gauging system; and
iv. The extent/rigor of operator monitoring.
3. Proof tested in accordance with the validated arrangements and procedures
with sufficient frequency to ensure the specified safety integrity level is
maintained.